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extensible programming language in the Scheme family

Racket (previously PLT Scheme) is a programming language suitable for
scripting and application development, including GUIs and web
services.

It supports the creation of new programming languages through a rich,
expressive syntax system. Supplied languages include Typed Racket,
ACL2, FrTime, and Lazy Racket, and R6RS Scheme.

Racket includes the DrRacket programming environment, a virtual
machine with a just-in-time compiler, tools for creating stand-alone
executables, the Racket web server, extensive libraries, and
documentation for both beginners and experts.